It is then no longer possible to log into the FTP server. That sounds OK to me.
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AnonymousI'm still concerned because my search results were mostly translations from German. This indicates it's not the way a native speaker would say itYou are quite mistaken about this. Being a translation from another language is not an indication that it is phrased in a foreign-sounding way in the target language.
AnonymousIt is then no longer possible to log into the FTP server.Ok, If we must pick one, this sounds more natural from a pure flow perspective. My version didn't use "then "as you may already have noticed, because the "if the FPT service ..." context in your passage didn't seem semantically flow with "then". To me, " then " wasn't needed.